Method of absorbing dilute nitrous gases.



' To all whom it may concern:

D S Airs rtrnn'r oration.

IBIRGER FJELD HALVORSEN, OF CHRISTIANIA, NORWAY, ASSIGNO R 'IO NORSK HYDRO- ELEKTRISK KVAELSTOFAKTIESELSKAB, 0F CHEISTIANIA, NORWAY.

No Drawing.

Be it known that I, 'BIRGER FJELD HAL- voRsnN, a subject of the King of Norway, residing at Ghristiania, Norway, have invented certain new and useful Improvements in the Method of Absorbing Dilute Nitrous Gases; and I- do hereby'declare the follow ing to be a full, clear, and exact description of theinvention, such as will enable others skilled'in the art to which it appertains to make and use the same. l

By the combustion of nitrogen into nitric oxide, for example, in an electric, high tensionarc, the hot nitrogen compounds producedare always highly diluted with air.

as, in consequence thereof, the absorbing agents, fluids or ases generally employed, prove insufficient or complete absorption.

The present invention has for its object the use of solid substances as absorbing carbonates, chlorids and phosphates).: The

nitrogen, and they are most suitably exposed agents, and thereby to obtain a considerably better absorption.

or theyshould be salts of acids whose acid radlcals are easily replaced by nitric acid (as absorbing agents. are suitably employed in a finely pu verized condition in order to obtain the absorption of a large amount of to the gases while the absorbents are kept in motion, either in any well-known form of 35 rotating drum or by suitably stirring them. In such a method of absorption when using dry slaked or finely pulverized unslaked lime an exceedingly far more powerful absorption is obtained than would be possible by the methods of absorbing now in use. An equally good result is obtalned with soda or caustic soda. chloridof sodium and chlorid of potassium, but, if these} latter substances are utilized,

Specification of Letters Patent. Application filed July 11, 1907. Serial No. 383,305.

p The solid substances should either be bases, as for instance lime,

Somewhat less'etficient are METHOD-OF ABSORBING DILUTE NITROUS GASES.

Patented Feb. :8, 1910.

valuable by-products are obtained. Such is also the case when using apatite and Thomas phosphate.

In addition to the improved absorption,

the method affords a' number of other technical advantages, especially with regard to the simplification of machinery and labor in the factories.

I claim 1. The method of absorbing dilute nitrous gases, which comprlses conducting said gases while hot into contact with dry solids capable of reacting with the said nitrous gas.

2. The method of'absorbing hot, dilute nitrous gases, which comprises conducting said gases while hot into finely divided dry,

solids capable of reacting with. said nitrous gases.

3'. The method of absorbing hot dilute nitrous gases. resulting from the oxidation 5. The method of absorbing hot, dilute nitrous gases resultingfrom the oxidation of 1 nitrogen by the electric arc, which comprises conducting the gases while hot into finely divided dry lime during the agitation of the latter, thereby producing calcium nitrate.

In testimony that I claim the foregoing as my inventiomI have signed my name in presence oftwo subscribingwitnesses.

BIRGEB FJELD HALVORSENI- Witnesses: I i

MICHAEL ALGER, HENRY BORDEWICH. 

